Improvement in tappets for stamp-rods



UNITED STATES PATENT OFFICE.

JAMES BRODIE, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN TAPPETS FOR STAMP-RODS.

Specification forming part of Letters Patent N 0. 183,631, dated October24, 1876; application filed March 13, 1876.

To all whom it may concern:

Be it known that I, JAMES BRODIE, of the city of San Francisco, State ofCalifornia, have invented an Improvement in Tappets for Stamp-Stems ofQuartaMills, of which the following is a specification:

My invention relates to the tappets of quartz-mill stamps, that receivethe strokes of the cams employed to raise the stamps. It consists in aniron plate and steel ring shrunk upon the end of the tappet, and formingthe face of the same, so that when the face is worn it can be removedwithout damage to the body of the tappet, which can thus be preservedfor any length of time. These means also cause the face of the tappet towear more evenly and for a greater length of time than heretofore.

The accompanying drawing shows, in Figure 1, a front elevation of thetappet, with the lower portion of its side broken away to show theconstruction of the face. Fig. 2 is a plan View of the face of thetappet.

The tappet is that part of the machinery in a quartz-mill secured to thestamp-stem, and against which the strokes of the cam are received. Theaction of the cam employed to raise the stamps causes the stem and itstappet to make a rotary as well as a vertical movement, and the frictionof the cam upon the face of the tappet causes the surface, andparticularly the rim, to Wear away in a short time, and veryirregularly. Thus the operation of the mill is soon impaired by theimperfect action of the stamps.

My invention consists in constructing the face of the tappet A of twokinds or qualities of metal, difl'ering from each other in degrees ofhardness, the ring being formed of a steel ring, 0, and the rest of thearea within this rim being composed of an iron plate, D. As the actionof the cam upon the tappet to give it the rotary movement produces anunequal wearing away of the face where it is composed entirely of onekind of metal, by reason of the greatest amount of the friction comingagainst the rim of the tappet, I am enabled to keep the face smooth andequal by making the part having the most work of a harder metal than theother portion of the face. Therefore the cam produces an equal wearingof the hard-metal rim C and the softer face D Within it.

The end of the body A of the tappet is diminished in size to receive thesteel ring, which fits closely to the body, and projects beyond the endof the same. This steel ring is beveled inwardly on the inside, where itprojects beyond the bottom of the tappet, as shown by a. The rim of theiron plate D has an outward bevel, b. The steel ring is heated, when theplate D is placed in the bevel a, and the ring shrunk into the positionshown in Fig. 1, thus holding all the parts firmly together.

When the plate and the steel ring, or either, are Worn away, they can beeasily renewed, and the body of the tappet thus preserved.

I am aware of the patent granted November 12, 1872, to B. McCauly,showing a tappet with a broad steel ring shrunk into a recess on the endof the tappet, and forming a part of its face. This device, however,provides only for the smooth and regular wear of the face of the tappet,and not for the renewal of such face when worn out, While I provide forthe complete renewal of the face of the tappet as well as for its evenwear.

Having thus fully described my invention, what I claim therein as new isThe combination, with the metallic body A of a tappet, having adiminished end, of the steel ring C, projecting beyond the said smallend of the tappet, and provided with the bevel a, and the iron plate D,having beveled edge b, the several parts being constructed, arranged,and secured in position substantially as described and shown.

Witness my hand and seal this 1st day of March, 1876.

JAMES BRODIE. [L. s.] Witnesses:

O. W. M. SMITH, OLE ANTHONY.

